CVE-2026-66323
CVE-2026-66323 is a medium-severity vulnerability in Microsoft Edge Chromium with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-141.
Key facts
- Severity: Medium (CVSS 3.x base score 5.4)
- EPSS exploit prediction: 0% (33rd percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-141
- Affected product: Microsoft Edge Chromium
- Published:
- Last modified:
Description
Improper neutralization of parameter/argument delimiters in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network.
Frequently asked questions
- What is CVE-2026-66323?
- Improper neutralization of parameter/argument delimiters in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network.
- How severe is CVE-2026-66323?
- CVE-2026-66323 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
- Is CVE-2026-66323 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (33rd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-66323?
- CVE-2026-66323 affects Microsoft Edge Chromium. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-66323?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2026-66323 published?
- CVE-2026-66323 was published on 2026-08-28 and last updated on 2026-09-11.
References
Affected products (1)
- cpe:2.3:a:microsoft:edge_chromium:*:*:*:*:*:*:*:*
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